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Method adopting neutral salt electrolyte to electrolytically extract tiny impurities from steel

An electrolytic extraction and electrolyte technology, which is applied in the field of metal physics research, can solve the problems of high cost, high requirements for the electrolytic environment, and large sample quality, and achieve the effect of intact composition and shape, simple and convenient operation, and low cost

Inactive Publication Date: 2009-10-14
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional method is often limited to the use of acidic or alkaline electrolytes, and its main disadvantages are: 1. The quality of the electrolyzed sample is large, the electrolysis time is long, and the cost is high; 2. The inclusions in the steel are easily soluble in acidic or alkaline environments Then it disappears during the electrolysis process; 3. The size of the obtained inclusions is large, which can no longer meet the needs of current research work
Although some new technologies for electrolytic inclusions have solved the above difficulties, the requirements for the electrolytic environment are relatively high, and the cost is generally high

Method used

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  • Method adopting neutral salt electrolyte to electrolytically extract tiny impurities from steel
  • Method adopting neutral salt electrolyte to electrolytically extract tiny impurities from steel
  • Method adopting neutral salt electrolyte to electrolytically extract tiny impurities from steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment one: first configure electrolyte, formula is as follows: (wt%)

[0023] Sodium citrate: 0.2%, sodium chloride: 1%, ferrous sulfate: 3%, ammonium chloride: 2%, deionized water: 93.8%

[0024] Put the above electrolytic solution into the electrolytic cell, use the graphite electrode as the electrolysis cathode, and use the pipeline steel X70 steel sample containing inclusions as the anode. When starting electrolysis, adjust the electrolysis potential to 3-10V, and the cathode current density to 0.02-0.1A / cm 2 . Electrolyze until the anode sample is completely dissolved.

[0025] After the solution obtained by electrolysis is centrifuged with a centrifuge, the precipitate is added to a saturated ammonium salt (such as ammonium nitrate) solution, reacted and dissolved in a water bath, and centrifuged and dissolved repeatedly until no ammonia gas is released. The precipitated matter is added to deionized water, and repeatedly centrifuged and clarified in a cent...

Embodiment 2

[0026] Embodiment two: first configure electrolyte, formula is as follows: (wt%)

[0027] Sodium Citrate: 0.1%, Sodium Chloride: 4%, Ferrous Sulfate: 1%, Ammonium Chloride: 2%, Deionized Water: 92.9%

[0028] In this embodiment, the above electrolytic solution is put into an electrolytic cell, a graphite electrode is used as an electrolysis cathode, and a semi-process electrical steel sample containing inclusions is used as an anode. When starting electrolysis, adjust the electrolysis potential to 3-10V, and the cathode current density to 0.02-0.1A / cm 2 . Electrolyze until the anode sample is completely dissolved.

[0029] After the solution obtained by electrolysis is centrifuged with a centrifuge, the precipitate is added to a saturated ammonium salt (such as ammonium nitrate) solution, reacted and dissolved in a water bath, and centrifuged and dissolved repeatedly until no ammonia gas is released. The precipitated matter is added to deionized water, centrifuged and clari...

Embodiment 3

[0031] Embodiment three: first configure electrolyte, formula is as follows: (wt%)

[0032] Sodium citrate: 0.4%, sodium chloride: 1%, ferrous sulfate: 4%, ammonium chloride: 5%, deionized water: 89.6%;

[0033] In this embodiment, the above-mentioned electrolyte solution is put into an electrolytic cell, a graphite electrode is used as an electrolysis cathode, and a pipeline steel X80 steel sample containing inclusions is used as an anode. When starting electrolysis, adjust the electrolysis potential to 3-10V, and the cathode current density to 0.02-0.1A / cm 2 . Electrolyze until the anode sample is completely dissolved.

[0034] After the solution obtained by electrolysis is centrifuged with a centrifuge, the precipitate is added to a saturated ammonium salt (such as ammonium nitrate) solution, reacted and dissolved in a water bath, and centrifuged and dissolved repeatedly until no ammonia gas is released. The precipitated matter is added to deionized water, centrifuged an...

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Abstract

The invention relates to a method adopting neutral salt electrolyte to electrolytically extract tiny impurities from steel and belongs to the research approach field of physics of metals. The method comprises the detailed steps of: mixing sodium citrate, sodium chloride, ferrous sulfate and ammonium chloride according to a certain proportion so as to be taken as a neutral electrolyte; adopting ammonium chloride solution to react with non-solute in water bath after electrolysis; repeatedly dissolving precipitate till the precipitation mass is stable; and obtaining the final product, namely, the required impurities. By adopting the neutral salt electrolyte for electrolysis, the method can obtain the micron-level and nanometer-level tiny impurities which have complete appearance and distinct components by observation with a scanning electron microscope.

Description

technical field [0001] The invention relates to a method for electrolytically extracting fine inclusions in steel by using a neutral salt electrolyte, and belongs to the field of metal physics research methods. Background technique [0002] The study of small inclusions in steel is of great significance for improving various important mechanical properties of steel materials. In order to better study the morphology and composition characteristics of its inclusions, so as to analyze their effects on the steel sample matrix, it is necessary to keep them intact Extracted from the steel sample without damage. The traditional method is often limited to the use of acidic or alkaline electrolytes, and its main disadvantages are: 1. The quality of the electrolyzed sample is large, the electrolysis time is long, and the cost is high; 2. The inclusions in the steel are easily soluble in acidic or alkaline environments 3. The size of the obtained inclusions is relatively large, which ...

Claims

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Application Information

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IPC IPC(8): G01N1/28G01N23/225
Inventor 孔祥华王帅翟旭邓军华孙彦辉
Owner UNIV OF SCI & TECH BEIJING
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